Oscillating system



y 1936- N. E. LINDENBLAD OSCILLATING SYSTEM Filed Jan. 14, 1933 INVENTOR- NILS E. LINDENBLAD- ATTORNEY- Patented May 26, 1936 OSCILLATING SYSTEM Nils E. Lindenblad, Port Jefferson, N. Y., assignor to Radio Corporation of America, a corpora.

- tion of Delaware Application January 14, 1933, Serial No. 651,810

. '5 Claims. This invention relates to an oscillating system and especially to an oscillating system of the cathode-ray type used for the production of ultra.

short wave length electrical energy.

- It is an object of the present invention to providea cathode-ray oscillating system especially adapted for the efiicient generation of ultra short wave length electrical energy. To provide such a system, according to the present invention, proper consideration is made for the time lag and impedance changes along the control electrodes or deflecting electrodes, and targets, power electrodes or plates of the cathode-ray oscillator. Thatis, by properly associating with the electrodes ofthe oscillator, suitable tuned circuits and, by suitably. coupling the circuits togetherby means of adjustable transmission lines, correct conditions for ultra short wave length electrical energy may be had, which conditions were heretofore unattainable with ordinary tuned circuits and inductive supply of energy to the deflecting electrodes g The-invention is more fully described in connection with the accompanying drawing which,

for the production of a. concentrated stream of electrons comprising a cathode 2, mounted within an evacuated container-3 energized by the action of a suitable transformer 4 supplied with alternating heating energy. Electrons emanating from the cathode are concentrated by the action of an annular electrode 6 maintained at a suitable negative potential by virtueof the conductor 8 coupling it to source of potential l0 Flow'of the concentrated stream of electrons is caused by the attraction of cylindrical anode l2,

polarized to a high positive potential by connectionthrough a protective resistor IE to Source ID.

Anode cylinder I2, offering no obstruction to the path of the electron stream, allows it impinge, when properly deflected by the action of deflector plates or control electrodes l4, 5, against the' anodes or. target electrodes I8, 20 placed in the path of the deflected electron stream.

The targets I8, 20, are coupled to a tuned circuit 22 formed of an adjustable U-shaped metallic conductor 24. A similar circuit 26 is connected to the deflecting electrodes l4 l6 and connected to the anode circuit 22 by means of transmission line 34. h

' The deflecting electrodes are connected through circuit 26 at the voltage nodal point thereof through protective resistor 2'! to a suitable source of polarizing potential 28. The protective re-- sistors are inserted as they tend to prevent short 5 circuiting of the sources of potential should any of the electrodes become grounded, and, since they ofl'er some protection to operators in the event that they should happen to touch the bare metallic tuned circuits 22, 26. Polarizing potential is supplied in a similar fashion to the target electrodes I8, 20 from another source of potential 30 through another protective resistor 32. i i

As already indicated, the tuned circuits 22, 26 are coupled together by means of a transmission line 34, coupled to suitable impedance points in v circuits 22, 26 having, in series therewith U-shaped metallic slides 36, 38 for varying the effective. length thereof. Condensers 40, 42 are also placedv in series with the linein order to prevent cross application of potentials from sources 30, 28. The electron stream, indicated by dotted lines, passing between the control electrodes l4, l6 towards the electrical center between the two target electrodes, will if a disturbance occurs on the electrodes, be deflected so as to hit one of the two targets I8, 20. By virtue of this shock exclta-' tion of circuit 22, a current impulse is created 1 flowing through the U-shaped slide 24 connecting 'cuit 26 connecting the deflecting electrodes. The

latter disturbance, by suitably altering the length of the transmission line by means of adjustable slides 36, 38, will cause the deflecting electrodes to deflect the electron stream in the opposite direction. In this manner, self sustained oscillations will ensue, the transmissionlinesacting somewhat in the fashion of the well .known'feed back arrangement used in connection with triodes.

- By suitably spacing the variouselectrodes, harmonic oscillations may be diminished'or entirely done away with. 'That is, harmonic oscillations may be present but, as they will be of a much lesser intensity than those fundamental frequency oscillations corresponding in frequency to the tun- 50 ings of the-circuita'by suitably spacing and choosing the dimensions of target electrodes I 8, 20, the harmonic oscillations of the electron stream'may be prevented from causing any appreciable excitation of the circuits. I

Moreover, the harmonic oscillations may be suppressed by inserting parallel tuned circuits (not shown) in the transmission line 34, tuned to the harmonic frequencies.

Modulation of the oscillatory energy set up in tuned circuit 22 may be accomplished by introducing modulating currents from transmitter 50 and amplifier 52 by means of transformer 44 to the accelerating anode cylinder 12 as shown. Modulated energy may then be taken from the circuit by means of a transmission line 46 and transmitted by a suitable radiating antenna 48.

Having thus described myinvention, what I claim is:

1. In a cathode-ray oscillating system, means for producing a stream of electrons, deflecting electrodes adjacent said stream, target electrodes in the path of said stream, a tuned circuit consisting of a pair of parallelly disposed conductors,

each conductor having uniformly distributed inductance and capacity throughout its length cou pled to said target electrodes, a tuned circuit consisting of a pair of parallelly disposed conductors having uniformly distributed inductance and capacity throughout their lengths coupled to said deflecting electrodes, and means comprising a pair of parallelly disposed conductors having uniform- 1y distributed inductance and capacity throughout their lengths for coupling the circuits together whereby continuousoscillatory deflection of said electron stream ensues. 2. In a cathode-ray oscillatory system, the combination of means for producing a stream of electrons, deflecting electrodes adjacent said stream for deflection thereof, target electrodes in the path of the deflected stream, a tuned circuit comprising a U-shaped conductor system connected to the target electrodes, a tuned circuit comprising a U-shaped conductor system connected to the deflecting electrodes, and a two-conductor transmission line coupling the tuned circuits together whereby continuous oscillation of said electron stream from one target to another ensues, the' conductors of said transmission line having uniformly distributed inductance and capacity throughout their lengths.

3. In a cathode ray oscillating system, means for producing a stream of electrons, two deflecting electrodes adjacent said stream, a U-shaped conduotor coupling together said two deflecting electrodes, two targets in the path of the deflected electron stream, a U-shaped conductor coupling together said two targets, means for supplying suitable potentials to said U-shaped conductors at voltage nodal points on said conductors, and 5 connections from the legs of one U-shaped conduotor to the legs of the other U-shaped conductor for causing continuous oscillatory deflection of said stream, said connections being adjustable over the legs of said U-shaped conductors.

4. In a. cathode ray oscillating system, means for producing a stream of electrons, two deflecting electrodes adjacent said stream, a U-shaped conduotor coupling together said two deflecting electrodes-two targets in the path of the deflected electron stream, a U-shaped conductor coupling together said two targets, a source of negative po tential connected to said first U-shaped conductor at one of its voltage nodal points, a source of positive potential connected to said second U shaped conductor at one of its voltage nodal points, and a pair of wires capacitively coupling the legs of said first U-shaped conductor to the legs of said second U-shaped conductor, whereby continuous oscillatory deflection of said stream ensues, said pair of wires being adjustable over thelegs of said U-shaped conductors.

5. In a cathode ray oscillating system, means for producing a stream of electrons, two deflecting electrodes adjacent said stream, an accelerating electrode between said means and said deflecting electrodes, a U-shaped conductor coupling together said two deflecting electrodes, two targets in the path of the deflected electron stream,

a U-shaped conductor coupling together said two targets, means for supplying suitable potentials to said U-shaped conductors at voltage nodal points on said conductors, and connections from the legs of one U-shaped conductor to the legs of the other U-shaped conductor for causing continuous os-, cillatory deflection of said stream, means in circuit with said accelerating electrode for modulating the oscillations produced, a utilization circuit, and a pair of wires extending from said utilization circuit to points on the legs of said second U-shaped conductor which are oppositely disposed with respect to the voltage nodal point on said conductor to which potential is supplied.

NILS E. LINDENBLAD. 

